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The binning is likely a by-product of the allotment of GPU's each company get sent. Asus, Gigabyte and MSI (AMD+Nvidia),Sapphire, EVGA and Palit (vendor specific) hold the largest marketshares*, thus have a larger pool to bin from. This probably shows up best when you look at the OC percentages of their top bins (DCII, TFIII, SOC, Toxic, Classified, Sonic Platinum).
Theoretically, the first launch reference cards should follow the standard distribution curve of overclockability, since they are all the same card, off the same production line (PC Partner or Foxconn), but I wouldn't be overly surprised if the stronger AIB's warrant some pre-distribution binning.
*Galaxy being the odd one out. They don't seem overly interested in binning for high clocks, and even when they do, have a habit of pricing their top bins (KFA2 Anarchy for example) the same as reference cards. OK cards, but the short warranty is a killer in the resell market.
I'll second that. My GTX 580's are EVGA also. Very rare to to see a company put the time and effort into customer service and the enthusiast userbase that EVGA do. Many a time I've had what amounts to realtime troubleshooting help from Jacob and Co on their forums. Having the company step up to the plate on custom BIOS's and workarounds when XFX, BFG, and Nvidia themselves showed little interest with (noteably Nvidia chipset mobo's) products is probably why EVGA have both a high profile amongst consumers, and tend to keep those customers going forward.
BTW: Nice clock...the benefit of full cover blocks!
Overclock GPUs do not give big gains at the time of this article because of the manufacturing process. 40nm GPUs (6750 / 6970 / GTX560 ti) do not have much headroom for OC. Even so, the 6970 was a bad choice, should have been used the 6950 which overclocks much better.
At this time(2014) and since 2012, overclock makes much more sense now with 28nm GPUs because they have much more overclock headroom and gains are considerably larger.
In my case, I have an MSI 7850 Power Edition for the last 2 years and I just have not bought a new and better card yet because of the gains that I've got with the OC, that are huge!
In this article, we saw overclocks betwen 6% and 14%... and gains of 1, 2 or 5 fps at best. My 7850 have 44,5% overclock on the GPU and 25% an the memory, this is almost 400 mhz overclock on GPU and 300 mhz in the memories chips. The real clock now are 1240 / 1500 MHz (860/1200 reference clocks ) with the original air Twin Frozer IV cooler and just +20% power tune and only +90mv (1.135v stco to 1.225v OC'ed). This represents, in general, a 35% improvement over the stock 7850s, in some cases like BF3 or Metro LL +40% boost! It's actually 10~15% faster than 7870 stock that costs +50€ (70USD)
... Was it worth it? Of course, I got the performance of two classes above, such as 7950/ R9 280 or the green GTX760 that cost almost twice the price!
Now, you can pick the new GTX 970 for $350 and overclock it to match or even outperform the GTX980 (best single gpu at this time) which costs $200 more. So, yes it worth it!